Best time to go is from October through March. Typically, TVA drops the lake level during that time and you can drive around the rocky trail that follows the shore of the lake. It's a beautiful drive. The rest of the trails are also wet and not as dusty during this time for an added bonus.
~Lots of modded Jeeps and a Toyota 4Runner~
My favorite quote from the press release.. sad but true: "Chrysler claims its products, especially the Jeeps, can handle all sorts of terrible conditions, churning through muddy swamps, climbing mountains, and crossing rivers. Turns out they cannot even handle a car wash."